I need to analyze this data.

He has expert knowledge.

He is studying computer science at a specialized school.

He is a specialist fool, with no interest in anything outside his field.

He couldn't say anything about issues outside of his field of expertise.

There are many different specialty stores in this town.

I learned how to calculate the harmonic mean in math class.

The harmonic series continues indefinitely, but its sum is not finite.

Vowel harmony plays an important role in the phonology of certain languages.

There was discord between them.